Production of high molecular weight polybenzimidazoles

Details Production of high molecular weight polybenzimidazoles Production of high molecular weight polybenzimidazoles

C - Chemistry, Metallurgy

08

G

402/171

C08G 73/18 (2006.01)

Patent

CA 1215192

ABSTRACT OF THE DISCLOSURE This invention provides a two stage melt polymerization process for the production of an improved type of high molecular weight polybenzimidazole, which involves the use of an arylphosphinic acid or arylphosphonic acid polymerization catalyst. The process provides poly-2,2'-(m-phenylene)-5,5'- bibenzimidazole of improved color and plugging value, and is further characterized by an inherent viscosity of at least about 0.7 dl/g, and a weight average molecular weight of at least about 100,000.

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